@article{766677b0fc4d4584917170380e764636,
title = "Charge Transfer from Carbon Nanotubes to Silicon in Flexible Carbon Nanotube/Silicon Solar Cells",
abstract = "Mechanical fragility and insufficient light absorption are two major challenges for thin flexible crystalline Si-based solar cells. Flexible hybrid single-walled carbon nanotube (SWNT)/Si solar cells are demonstrated by applying scalable room-temperature processes for the fabrication of solar-cell components (e.g., preparation of SWNT thin films and SWNT/Si p–n junctions). The flexible SWNT/Si solar cells present an intrinsic efficiency ≈7.5% without any additional light-trapping structures. By using these solar cells as model systems, the charge transport mechanisms at the SWNT/Si interface are investigated using femtosecond transient absorption. Although primary photon absorption occurs in Si, transient absorption measurements show that SWNTs also generate and inject excited charge carriers to Si. Such effects can be tuned by controlling the thickness of the SWNTs. Findings from this study could open a new pathway for designing and improving the efficiency of photocarrier generation and absorption for high-performance ultrathin hybrid SWNT/Si solar cells.",
keywords = "carbon nanotubes, femtosecond transient absorption spectroscopy, flexible photovoltaics, hybrid solar cells, silicon",
author = "Xiaokai Li and Marina Mariano and Lyndsey McMillon-Brown and Huang, {Jing Shun} and Sfeir, {Matthew Y.} and Reed, {Mark A.} and Yeonwoong Jung and Taylor, {Andr{\'e} D.}",
note = "Funding Information: The authors gratefully acknowledge the Sabotka Research Fund, Teracon Corp., the Connecticut Space Grant Consortium, and the National Science Foundation NSF-PECASE award (CBET-0954985) and (DMR-1410171) for partial support of this work. This research was also supported as part of Nanostructures for Electrical Energy Storage (NEES), an Energy Frontier Research Center funded by US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES) under Award No. DESC000160. Facilities were provided by Yale Institute for Nanoscience and Quantum Engineering (YINQE) and NSF MRSEC DMR 1119826 Center for Research on Interface Structures and Phenomena (CRISP). M.M. acknowledges the Yale Climate and Energy Institute (YCEI) fellowship for support during this work. In addition, M.M. acknowledges Dr. James Mayer and Carolyn Valdez for access to Cary5000 for transmission measurements. Chasm Advanced Materials (CHASM) are acknowledged for their kind supply of single-walled carbon nanotubes. Publisher Copyright: {\textcopyright} 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",
year = "2017",
month = dec,
day = "27",
doi = "10.1002/smll.201702387",
language = "English (US)",
volume = "13",
journal = "Small",
issn = "1613-6810",
publisher = "Wiley-VCH Verlag",
number = "48",
}